While on her concert tour in the US, my Austrian friend Andrea brought along a small electric fabric-steamer. The steamer draws a current of 4.2 A on a 220 V line in Austria. If she plugged it
into an electrical line in the US, where the household voltage is 110 V, how much current would
the steamer draw? How well do you think it will perform?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?